Free Fall

Free Fall Acceleration due to gravity Prepared by: JG Chavez for MCS

What is free fall • Motion under the influence of gravity per se.

Prepared by: JG Chavez for MCS

What is free fall • Why do objects fall to the ground when released? Answer: Due to gravity

Prepared by: JG Chavez for MCS

Acceleration due to gravity Slope = g = 9.8 m/s2. • Hence= gravity = 9.8 m/s2 since its direction is towards the center of the earth g= -9.8m/s2.

Prepared by: JG Chavez for MCS

What is free fall? • When you drop objects of different sizes and weights, do they reach the ground at the same time?

Prepared by: JG Chavez for MCS

What is free fall? • When you drop objects of different sizes and weights, do they reach the ground at the same time?

Prepared by: JG Chavez for MCS

Theory of Motion According To Galileo • According to Galileo, all falling objects accelerate at the same rate. At a given location on the earth and in the absence of air resistance, all objects fall with the same uniform acceleration. Thus, two objects of different mass, dropped from the same height, will hit the ground at the same time. Prepared by: JG Chavez for MCS

Falling Object

Prepared by: JG Chavez for MCS

Velocity and Distance for a Falling Object The speed of the ball is increasing by the same amount; 5 m/s .

Prepared by: JG Chavez for MCS

Throwing Up a Ball

Prepared by: JG Chavez for MCS

Velocity and Distance The rate at which the velocity changes each second is the same.

Prepared by: JG Chavez for MCS

Formulas for Free fall • vf= vi + gt • d= vit + ½ gt2 • vf2= vi2 + 2gd

Prepared by: JG Chavez for MCS

Sample Problem 1. A bowling ball falls freely (near the surface of the Earth) from rest. How far does it fall in 4 seconds, and how fast will it be going at that time?

Prepared by: JG Chavez for MCS

•

v = vi + gt = 0 + (-9.8 m/s2)(4s) = - 39.2 m/s because it is downward d = vit + ½ gt2 = 0 + ½ -9.8 m/s2 (4s)2 = - 78.4 m because it is downward

Prepared by: JG Chavez for MCS

FIN

Prepared by: JG Chavez for MCS